Datasheet > A89503KLPTR-5

A89503KLPTR-5

更新时间： 2024-10-28 20:06:27

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
45页	2739K
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Motion Control Electronic,

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A89503KLPTR-5 技术参数

生命周期：	Active	Reach Compliance Code：	compliant
Base Number Matches：	1

A89503KLPTR-5 数据手册

A89503

80 V Automotive Half-Bridge MOSFET Driver

• A_V= 20 (SAG[2:0] = 0b010)

Current Sense Amplifier Configuration

• V_OOS= 1 V (SAO[3:0] = 0b1001)

Amplifier gain, A_V, and output offset zero point voltage, V_OOS

may be set to a range of values by the SAG[2:0] and SAO[3:0]

variables respectively as defined in the Current Sense Ampli-

fiers section above. It is important that both values are selected

to ensure the absolute voltage at the CSO output, V_CSO, remains

within the amplifier’s dynamic range, V_CSOUT, and the dynamic

range of any downstream signal processing circuitry. Allowance

must be made for both positive and negative current flows within

the sense resistor.

V_IDranges between –20 mV and +40 mV and V_CSObetween

0.6 V and 1.8 V. V_CSOremains within the amplifier dynamic

range, V_CSOUT, of 0.3 V to 4.8 V. However, if A_Vis increased

to 50, V_CSOattempts to drive to 0 V and 3.0 V, the amplifier

dynamic range limits are not complied with, and the amplifier

output saturates at its negative limit. This situation could be rem-

edied by reducing A_Vto 30 (0.4 V < V_CSO< 2.2 V) or increasing

V_OOSto 1.5 V (0.5 V < V_CSO< 3.5 V).

With reference to Figure 3, the relationship between phase cur-

rent I_PH, sense resistor value, R_S, and differential amplifier input

voltage, V_IDis given by:

Current Sense Amplifier Output Signals

As defined in Figure 3, the current sense amplifier output signals

on the CSO pin is internally referenced to the output offset which

can be made available on the CSO terminal by setting the SAT bit

to 1. The sense amp output voltage and the output offset voltage

may be measured consecutively with respect to ground, and the

values subtracted to give the required output signal voltages as

V_ID= V_CSP– V_CSM= I_PH× R_S

The current sense amplifier’s output voltage on CSO with respect

to the programmed value of output offset is:

V_CSD= (V_CSP– V_CSM) × A_V

V_CSD= V_CSO– V_OOS

The absolute voltage on CSO when SAT = 1 with respect to

ground is therefore:

The Input Offset Voltage, V_IOS, and the associated drift, ΔV_IOS

V_CSO= [(V_CSP– V_CSM) × A_V] + V_OOS

multiplied by the selected amplifier gain, A_V, represent the offset

and offset drift limits that apply to V_CSD. The Output Offset Error

limits, E_VO, and Output Offset Drift limits, V_OOSD, apply directly

to V_OOS. E_VOand V_OOSDdo not affect current sense output

accuracy.

If, for example, the following parameter values are assumed:

• R_S= 1 mΩ

• I_PH= –20A to +40A

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

1...38 39 404142 43 44 45

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